4 Written questions
3 Multiple choice questions
- they provide positional information in the embryo
- 4.5 billion years ago ... 3.9 billion years ago
3 True/False questions
The relative lengths of the frog and mouse branches in the phylogeny in Figure 26.13 in your textbook indicate that
frogs evolved before mice.
the genes of frogs and mice have only coincidental homoplasies.
the homolog has evolved more slowly in mice.
the homolog has evolved more rapidly in mice.
mice evolved before frogs. → they provide positional information in the embryo
Radiometric dating _____.
allows us to determine an absolute, errorless date
only works on rocks younger than 75,000 years
allows us to indirectly date fossils up to billions of years old based on minerals in surrounding volcanic strata
relies on the fact that the daughter isotope decays to the parent isotope at a constant rate
can be used to directly date fossils in sedimentary rock → "tinkering" with existing structures
Evolution works by _____.
"tinkering" with existing structures
predicting the future
molding the environment to conform to the organisms living in it
constantly increasing complexity
converging on a particular phenotype → "tinkering" with existing structures